Water tube boiler



Sept. 8, 1936. F. T. JENKINS WATER TUBE BOILER Filed Sept. 25, 1954 INVENTOR F? azlgl cz TJZNMNs 6 CT ATTORNEY Patented Sept. 8, 1936 UNITED STATES PATENT OFFIQE WATER TUBE BOILER Frederick T. Jenkins, Seattle, Wash.

Application September 25, 1934, Serial No. 745,410

1 Claim.

This invention relates to improvements in boilers and it has reference more particularly to water tube boilers of a type especially adapted to building and residence heating in connection 43 either with steam or with hot water heating systems; it being the principal object of this invention to provide a relatively inexpensive, eflicient and durable boiler construction, including novel features whereby easy accessibility to all of the boiler tubes for cleaning, fepair or removal from either end of the boiler is made possible and wherein the tube sheets are constructed to accommodate expansion and contraction without danger of loosening joints or connections.

Other objects reside in the various details of construction and in the combination of parts as will hereinafter be more fully described.

In accomplishing these objects, I have provided the improved details of construction, the preferred forms of which are illustrated in the accompanying drawing, wherein- Fig. l is a vertical, sectional view of the boiler in a plane centrally and lengthwise thereof.

Fig. 2 is a view, one half in front elevation and the other half in vertical section, as seen on the line 2-2 in Fig. 1.

Referring more in detail to the drawing- The boiler, in its entirety, comprises a fire box or base portion I and a boiler portion 2 that is arranged upon and secured to the base. The fire box is of rectangular form and composed of opposite side Walls 3-3, a rear end wall 4, a bottom wall 5 and a front end wall 6 the latter having an opening 1 over which a door 8 is fitted. The

top of the fire box is open and the top edges of the enclosing walls are formed with horizontal, inturned flanges 9 on which the boiler 2 is supported. It is also preferred, in the event of heating the boiler by use of an oil burner, as designated at Ill, that the fire box be provided with a lining of flre brick, or the like, as designated at H.

The boiler portion 2 comprises an outer shell made up of opposite side plates l2l2, a front plate or wall l3, and rear plate M, which plates together form a rectangular enclosure of the same horizontal dimensions as the fire box and resting upon the flanges 9 of the box walls. Spaced within the walls forming the shell are opposite side walls I5 -I5 front flue sheet "5 and'rear flue sheet ll; together enclosing a. combustion chamber l8 which is in open communication at its base with the fire box through the open top of the latter. As is seen best in Fig. 2, the lower edges of the opposite side walls of the shell are turned inwardly to provide horizontal flanges |2a which are welded along their inner, edges as at l9, t0 the lower edges of the side plates I5l5 of the combustion chamber. Likewise, the lower edges of the front and rear walls are provided with inturned flanges l3a and Ma which are likewise 5'- welded to the lower edges of the front and rear flue sheets. Also, the opposite side walls l5-l5' have outwardly formed flanges 20' along their upper edges welded along their edges to the side walls of the shell. The top edge of the rear flue l0 sheet has a rearwardly turned flange 7 2| and this is welded along its edge to the top edge of the rear wall M. This construction provides a water and steam tight compartment intermediate the walls forming the shell and those forming the 1'6 combustion chamber for containing water as disclosed in the water legs 23 at opposite sides of the chamber and water legs 24 and 25 at front and rear respectively. A drum 26 is located across the top-of the boiler and this opens directly into 2.3 the boiler between the front wall and front flue sheet. Outlets, for pipe connections, are provided in the top of the drum, as seen at 28, for outflow of steam or for water circulation.

Within the boiler are water tubes 30. These 25 extend across the combustion chamber between the front and rear end flue sheets l6l'| in upwardly inclined position to facilitate circulation, and they are arranged in closely associated rows in staggered relation to effect better heating in 30 the passing of gases of combustion upwardly between them. A smoke pipe thimble 32 enters the upper end of the combustion chamber through the rear wall and rear flue sheet and is welded therein. Also, there is a bafiie wall 33 placed 35 across the chamber below this pipe and above the tubes and it extends slightly more than half way from the front to the rear flue sheet.

Where boilers are of such size that it may be desirable, stay bolts 38 may be employed between 40 the flue sheets and the front and rear plates of the shell. These bolts would be used in numbers as required to meet the condition. Also, it is preferred that the boiler be equipped with a water gauge as designated at 39 in Fig. 1. 45

For repair and inspection, the top of the chamber is formed with a top opening 34 and a closure member 35 is applied thereover. Also, at the front of the boiler is an opening 36 provided with a door 31. 50

A feature of the present invention resides in the details of construction permitting of easy removal of the water tubes 30 for cleaning, repair of replacement. And, furthermore, the invention provides for removal of all of the tubes 55 from either end of the boiler. As disclosed best in Fig. 1, the tubes are disposed in the upper portion of the combustion chamber and are upwardly inclined from rear to front of the boiler. To accommodate this inclination, the upper portion Ilia. of the front flue sheet which receives the tubes is inclined rearwardly in a plane perpendicular to the direction of the tubes. Also, the rear flue sheet has a similarly inclined portion Ila receiving the rear ends of the tubes and the lower edge of this inclined portion isjoined to the lower vertical portion of the sheet by a. rear- Wardly directed wall portion llb which joins with the lower portion and with the inclined portion in rounded bends, as at 40. This construction of the flue sheets permits of expansion or contraction to take place without any danger of breaking or loosening connections. The inwardly inclined portion llb of the rear wall of the fire box serves as a bafiie, whereby the rising gases of combustion are deflected forwardly along and between the tubes 36. The inclined portion lfia of the front tube sheet which mounts the upper ends of the tubes is inclined toward the stack connection 35 and acts as a bailie to direct the gases in that direction.

To provide for removal, repair or cleaning of all of the tube sheets from either end of the boiler, the front end wall l3 has an opening 42 therein over which a closure plate 43 is secured by bolts 44. Likewise, the rear wall has an opening \5 over which a closure plate 46 is fitted and secured by bolts 41. In each instance the bolts are mounted in a flanged member 48 welded to the wall about the opening. These openings are located in the walls in such position as to give accessibility to all tubes from either end of the boiler. Thus, in installing a boiler, it is not necessary to locate it in the clear for tube repair at each end, but only to see that one end is clear for this purpose.

Boilers of this character are relatively inexpensive because of the few parts and their easy assembly and welded connections. They are durable in use, easy to repair and very efficient in use.

Such boilers may be made in various sizes, and in different proportions than herein shown without departing from the spirit of the invention.

Havingthus described my invention, what I claim as new therein and desire to secure by Letters Patent is- In a boiler of the character described, a fire box having an open top, a boiler mounted on the fire box and comprising a combustion chamber having an open lower end registering with the open top of the fire box; said combustion chamber being enclosed by opposite side walls and front and rear tube sheets and having a stack connecting outlet at the top of the rear tube sheet; a shell enclosing the boiler and spaced from the walls of the combustion chamber to provide a water space about the chamber, a bank of upwardly inclined water tubes extending with upper and lower ends mounted respectively in the front and rear tube sheets; a bafiie overlying the tubes across the lower end of the bank; said front flue sheet having its upper portion, wherein the tube ends are mounted, inclined rearwardly toward the stack connecting outlet to a plane perpendicular to the tubes, and said rear sheet having its medial portion, wherein the rear ends of the-tubes are mounted, offset inwardly to a plane perpendicular to the tubes forming a forwardly directing baille.

FREDERICK T. JENKINS. 

